I think the mangaka did not want to loose that innocent love vibe of marshmallow yone and arai so they did not show the smex scene until they were adults... but my god, did yone loose all that weight because of all the sexual exercise pervy arai puts him into? XDDD lol! im happy i sensei included some adult lovin too > w <
*wibbles* Q A Q that was so heart breaking...
and I just realized that's the reason why it wouldn't allow MC to sleep and only stayed away when someone else was with him