Addictive Secret Sex

His trousers are her spoils of war...

Hmm...I was expecting this to be an incest tagged released since she mentioned her brother, but he came home with a friend instead so I guess that's why it isn't there.
Also, the good old 'I'll do anything if you don't tell' scenario. I'm sure her brother wouldn't really care, though?
That ending though. Ah...So his pants have been taken hostage, or should I say, as a trophy of sorts?

Excellent!

And that ending is pure gold. :D

Yep the imouto is definitely addicted to “it” now!

Dude got got at the end there

Damn that was hot.

Do Your Best Not to catch cold being stuck outside, Hattori-kun! Even more important, Do Your Best to get 'Onii-chan's APPROVAL', in order to avoid the confrontation where he would otherwise shout: "HEY MEEES-TER, WHAT DO YOU THINK YOU'RE DOING TO MY SEEES-TER?"

Seems Legit, Doesn't It?

Wonder how many young me had to run out the door sans pants a year?