@Wildfire_desu,
@jamesey: All a result of his "crush" on Ruka. If he'd stopped messing around, and let Risa climb the Big Mountain, he'd not be acting like this. First, he'd not have been white knighting for
a girl that has interest in some other man for as long as he had, nor would he be doing so now (any man worth his salt knows not to waste time and energy on a woman who would give him nothing in return); second, he'd be too busy thinking about Risa/enjoying her company to be jealous of a man in a healthy relationship (i.e., he could use his time and energy--especially mental--on a girl who wants to receive it all, and return the favor).
For all that talk and presentation of him being the only experienced non-virgin there, he sure does act like he is one.
All that aside, Senko has been ramping up her cute level for chapters, now.