Omorashi is a very specific thing for me, but I have favorite tropes so, let me yap abt that real quick ok?
• Embarrassed to have to go
Like, when the character can simply say "hey, I'm going to the bathroom real quick, I'll be right back", but they simply CAN'T, and it's not that they can't pee in public restrooms or anything, it's just that, the idea of someone else knowing about their bladder being full makes them so embarrassed!?
Like, baby is a bodily condition, just do it LOL
• Rubbing against something to relieve the pressure
It doesn't even make much sense, but I love it when the character rubs against their loved ones leg for a bit of relief, and especially when they verbalize the feeling, like "wow, that's much better" it's cute to imagine someone rubbing against someone they love purely for comfort.
• Peeing in a bottle/small containers
It's cute, okay, it's funny, especially when they don't quite know how to aim the stream and get confused trying, only to succeed and melt with relief, is even better when their loved ones see their faces and know immediately that they made it because their faces softened, like, from the front seat of the car looking at the person behind, is also funny when they say things like, "oh, you really need to go, don't you?", and the other trembled with shame.
• Other person helping to go
Okay, that's good because, imagine someone needing to go and another person being like "I'll help you" and then taking them to the bathroom and touching them to help them let it go faster, for example, massaging the bladder or holding they private parts to help stimulate the flow
When someone clearly needs to go and they loved ones decided to provoke them instead of getting overly worried, tickling, talking about liquids, and touching the bladder
It's even better when they find it cute and thats why they tease, like, putting someone that clearly is almost peeing their pants on they lap and squeezing them sides to make them squirm and clutch they private parts like their life depended on it, and then when they finally give in, they just hug and say everything's okay because, well, everything's okay