I Swear my Brother's the Protagonist of a BL Manga

Hello. Hashiwara Mitsuko speaking. I'm 16, a virgo, blood type O, and my favourite dish is stir-fried tomato and eggs. I have two loving (if a bit slow) parents, both in their mid-forties. I also have a twin brother, Mitsuo, blood type B, airhead extraordinaire and oblivious gay magnet.
Yeah. You heard that right. Hordes of guys drool over his ass each day, and it's my job to make sure scum like them don't manage to get close enough to contaminate him.
Anyway, somehow, we've been picked up and dumped in another world. A world filled with swords, magic, dragons and all that jazz.
You're f*cking kidding me, right? I've gotta deal with S-class heroes, demon kings and other super powerful beings lusting after my brother now?!
Haaah... Bring it on then! I'll beat you all so hard your great great great great grandparents will feel it!