There's a few things that I really enjoy about gaining:
1) outgrowing clothing - noticing that my clothes are getting tight is fine, but when they don't actually fit anymore - like when a t-shirt is too small, and rides up when I lift my arms (and the tightness around the arms from my arm fla
, or when buttoning up pants or a shirt requires me to inhale to do it. I have to admit, I do find it a turn on when I let out my belly and I can see the trackmarks of my waistband of my pants still fresh along my stomach.
2) taking up a lot more room with my fat ass. I can't tell you how turned on I was when I got to the point that fitting into a McDonalds/Burger King/whatever fast food booth required me to squeeze in. While riding public transit and when it's not busy, I like that I nearly take up two seats with how big I am now.
3) the contrast of then vs. now. Seeing older photos of me when I was thinner and comparing them with how I look now. Wow.