Definitely happens. Sometimes in the shower just noticing that a part of me is larger and softer is a trigger, often just rubbing my tummy or feeling the little tiny bit of future fupa fat is just a tingle inside that triggers it. Sometimes just being stuffed and feeling that full stretched belly feeling will do it.
It can be small things too; something pressing gently against the chest can be felt in the nipple and moob (I noticed nipple sensitivity and arousal increased significantly after gaining 50lbs), something as minor as just feeling my ass pressing against the seat further back from my center of mass than my brain is accustomed to, or as subtle as the bit of back fat above my ass touching the seat of the car because my clothes have become slightly too small and slid up a bit.
Sometimes that can be frustrating when it's obviously not a good time and place, especially when the arousal is making you get hard, which means you feel everything even stronger, so now you're in a feedback loop and getting a full erection in the very wrong place. Of course this also often happens when I see a very attractive large girl, so you gotta get creative in figuring out how to hide it and stop it. Many times focusing on a completely unrelated idea helps, but in severe cases you gotta pull up something very gross in your mind in order to shut it down.
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