MIAA-509 [Uncensored Leaked] My girlfriend's devilish little sister developed my anal hole and made me cum secretly - Luna Tsukino

<Male orgasms are secretly popular!> A male orgasm is when your prostate is stimulated, allowing you to orgasm like a girl. Pleasures that can't be achieved with a penis await you! This is the second installment in the series, balanced as an introduction to male orgasms, with a light setting and some rough play! The setting is similar to other works, with a slutty younger sister secretly seducing you into doing naughty things... and then it's off to the man's anal stimulation! The thrill of having your anus secretly developed without your girlfriend finding out is incredible!