technically you can blame Momo and Mea for this. All Rito did was think about it. And frankly... can you blame him? He's got so much T&A thrown at him it'd make a impotent man go for it. Sadly it's only in these dream worlds where the Rito Momo wants can be found. Too much resilient and pounded in virtue keeps us watching Momo and the others being thrown at the guy.
*tighten**grope* *grope*This...What is this feeling?*startle**shock*Senpai...It... tickles...