My younger sister likes to share her gym progress with me and she has a really fit body... I feel bad about it but it gets me hard as a tent thinking about her occasionally and I just send some bodypics back.
I used to have her on Snapchat and I would send her photos where my dick bulge was obviously showing through my pjs etc and it would spike my adrenaline knowing I shouldn't have done that but she would always send me back a photo smiling sometimes with her tongue out.
Once I found a hexbug in her bathroom and I just know she was using that to goon herself which gets me so horny thinking about her using it on her clit and squirting and cumming.
I know she's a freak like me because that's genetic so I hope she gets herself off to the pic I sent her today and reads this haha I know she has Reddit