in my head sbn absolutely adores tyn and thinks very highly of him. they’re super close and sbn always brags about him and praises him and she trusts him more than anyone else… she would never suspect her little brother as someone to hurt her or do anything wrong, which is why he gets away with so much at first. he’s always way too touchy with her and begs for them to cuddle and although sbn thinks they might be a bit too old for cuddling she still lets him cause she thinks that’s just how he finds comfort. she doesn’t even notice the wandering hands subtly groping her body while they’re cuddled up in her bed. tyn likes to steal her panties and bras so he can jerk off with them and sbn just brushes it off as them getting lost in the laundry, he also purposely barges into the bathroom while she’s showering with the excuse that he needs to piss but really he’s just trying to take a peek at her, and against his better judgment he even steals one of her dildos to fuck himself with it… it makes him feel so giddy knowing something that’s been inside her cunt is now inside him too. unfortunately his perfect little brother image can’t last forever :( he gets too desperate, wants to feel how his noona’s lips feel against his and how wet and warm her cunt would feel around his cock. so one day he pins her down on her own bed and tries to kiss her, but sbn tries to push him away and looks up at him with her eyes full of fear and confusion in a way tyn has never seen before, and he decides that he loves it. sbn asks why he’s doing this and he just laughs and says “don’t you get it, noona? i love you.” and then he grabs her face and forces her to kiss him properly. eventually sbn melts into the kiss but when tyn starts groping her tits and rutting his bulge against her clothed crotch she gets scared again and starts crying. tyn pulls away and wipes her tears off her face while pulling down her pants and he softly tells her that it’s ok and he’s just showing her how much he really loves her. tyn doesn’t even bother stretching her out, he honestly can’t wait any longer and he knows she can take it anyway. he pulls his own pants and boxers off and pushes sbn’s panties out of the way before lining up his cock and pushing in. sbn wails the whole time, crying out that it hurts and it’s so wrong and that they have to stop and she won’t tell anyone but it’s no use… tyn just keeps fucking into her and despite her pleas he even cums inside of her. poor sbn feels so gross and violated by her precious little brother but soon enough she’ll learn to love it <3 maybe she’ll even peg him in the future hehe