GDHH-034 My sister saw my AV and got turned on! By chance, I ended up watching the AV with her... When the sexy scene started, she started fidgeting and, naturally, staring at my erect dick...

My teenage sister has recently become very interested in naughty things! One day, she said she wanted to watch the exquisite AV that I, her older brother, have in my collection, so we decided to watch it together...! As the content gradually becomes more and more extreme, my sister fidgets while her crotch gets itchy... and since it's my AV collection, naturally I get a full erection too!! The dirty AV x my older brother's erection stare makes my sister's patience run out! Even though we know it's wrong, we both get excited and can't control our reason, so we end up having forbidden incestuous sex...