Bkdk having sex for the first time in their last year of High School after dating for about a year, and Izuku is so nervous about it he feels like he's gonna have a heart attack.
He did so much research and spent way too much money on this (he bought every possible condom size and every type of lube he could find and has douched multiple times already because he needs to master it before the time comes).
He wrote entire pages theorising what Katsuki might like or not like in bed and preparing for every possible case scenario.
Katsuki did research too,

#bkdk #nsfw #fluff #ficthread #abokink
College AU where jock!Katsuki asks nerd!Izuku to tutor him because he desperately needs to get higher grades if he wants to pass this year.
And then little nerdy Deku ends up being tutored by Katsuki on how to ride his monster cock. Turns out innocent blushing Deku is actually a slut who just wants a big strong man to fuck the shit out of him until he's a sobbing mess, unable to form any coherent thoughts. Just praising and begging Katsuki to keep fucking him, keep touching him, slap him /harder/, /harder/,