What nice wingmen the other two idols in the group were being for their friend.
After such a perfect set-up like that, no way either of them could resist the allure of some sweet Vanilla loving, and the end result turned out great.
Kijima-san had No Chance of Escape from a Double Wing-man (or perhaps, Double Wing-Idol) combination ... and a part of me suspects he was holding back his true feelings towards Maki (if RL stories about the idol industry in Japan is any indication).