Welcome to the Forum Tia.
For such a small post there is a lot to say about the subjects you have raised. As someone who has lost 87kg in a reasonable amount of time (153.7kg to 66.6kg in 60 weeks) I can certainly give you some insight on loose skin!
Firstly, I would advise to focus on the task at hand and worry about loose skin when it arrives (if it arrives). You'll have enough on your plate losing the weight you need to. The journey towards success will also mentally equip you for the challenges of maintaining weight loss and all the baggage of that part of the journey. So concentrate on what needs to be done now and the rest will take care of itself.
Secondly, in all the biographical books I've read about people who have lost significant amounts of weight...all of them except one ended up with loose skin. Many of them ended up having some sort of corrective surgery. The one that didn't, famously totes his "Method" as a way to avoid having loose skin. He lost weight very very slowly at the beginning and lost huge amounts towards the end of his journey after building muscle fitness. His experience is the exception...most people start with good weight losses (like you and me) and end up slowing right down towards the end. He took a really long time to lose his weight. What his book doesn't allow and ought to - is the importance of good genetic background and the fact that he was relatively young (young people's skin are more elastic) when he lost his weight.
Thirdly, there are no miracle products out there that can moisturise or regenerate your skin's elasticity. There are lots of beauty products out there that make many claims but have no real science to back them up. Save your money - they don't work. The best you can do is lose weight at a moderate rate (such as a kilo a week as recommended by the best weight loss experts) and drink lots of water to keep your whole system hydrated. The only other thing you can do is hope that youth is on your side and pray that you have a great gene pool!
Fourthly, your skin will become loose no matter what anyway...that is what we call aging. Get use to it...the only way you can avoid that is to follow the title of the Blondie song "Die Young - Stay Pretty"...not really the way you want to go!...life is too grand to stop that adventure so short.
It is just part of life. Rather than fight the inevitable it is better to embrace it with a bit of dignity instead.
Having a baby will also stretch your belly skin. My wife has always been very trim - but one pregnancy has given her loose belly skin. I stretched out my belly skin to a greater girth than hers and I did it for over 30 years longer than she did. What right do I expect to walk away from that action without consequence?
Fifthly, if you partner is worth his salt he will stand by you. If he doesn't then he isn't worthy of you. Love isn't about "looks" - it is about the heart. What is within is greater than what is outside. The greatest sexual attraction in any relationship happens in the mind. The physical attraction goes but a real relationship is deeper. Check out the elderly couple in the movie "The Notebook" for an exploration of that theme.
My wife is thrilled with my weight loss. It is a dream come true for her and the loose skin I have is a small price to pay for it.
Relationships can run into trouble during and after weight loss but only because the partner wasn't actively involved in the creation of the new healthy lifestyle that was being undertook. For the best results you must engage your partner in your new lifestyle. If you do it right you will find that the whole process will bring you even closer...and loose skin will matter even less.
Sixthly, losing the weight will more than make up for a bit of loose skin. Your life will be so much better for it. As much as you think your life will improve by losing that weight...the reality of it is so much more! In this Forum I'm always banging on about a better future - that is because it is so very much better than anything that you can imagine! Loose skin is such a small price to pay that it really isn't worth the worry. The pay off for losing the weight is so much the greater. Trust me...I'm living it!
And lastly, if it does bug you...there is always surgery. It will not deliver perfection (no surgery can - look at all those horrible plastic surgery results...yuck - give me natural any day) but at least it will take care of the worst of it. I was fortunate in this area. I had a belly hernia that needed operating on (part of the reason to lose that weight) and the surgeon agreed to "hack off" (this can never be described as plastic surgery) the extra belly skin free of charge (since he was there with the knife anyway
). It was worthwhile doing because I had so much around my gut that it was getting in the way and wasn't very hygienic. Understand I still have lots and lots of loose skin. On my hips I carry "saddlebags" of it like a gunslinger would carry two holsters. The skin around my groin and upper thighs particularly look horrific...but I'm not planning to do anything about them at all. I look upon them as a badge of achievement and a reminder to never ever regain that weight again!
Wishing you that better future!