The Virgin and the Laid-back Billionaire

Mika
I promised my best friend before she died that I'd honor her final request. I sort of always knew it was going to be something outrageous. But it's way worse than anything I ever imagined! She wants me to seduce her older brother?!! The famous billionaire brother sitting next to me while I read her letter... I've been so busy with school, I don't even know where to start. Help!
Tanner
My sister never shared what she had planned for Mika, but she did love to surprise me. It's the last of a long list of bequests I've been overseeing for the last year and I'm ready for a break. So I'm whisking this nervous sweetheart away with me to the lake house so I can see what she comes up with. I did warn her that if she succeeds in her assigned mission, I'm going to keep her forever...