A prince with a handsome female high school student as his partner!? RCTD-643

The popular girlfriend has a secret: she has an incredibly thick penis! She has a high sex drive, is a masturbation fanatic, and even lends her younger sister to her schoolmates for them to play with. Finally, her secret is discovered by the girls at school! She's brought to multiple orgasms, tied up and played with until she's orgasmed again, and captivated by the incredibly thick penis, becoming part of their harem!