Two sexy sirens squating/sitting, back to back, on a prostrate MC, lying on his back beneath them?
Could be. But surely not antagonistic and competitive Diana and Clare, who don't like each other, won't double-team Henry in the game as soon as this?
WTF? How the heck could something as weird as that happen while those particular two lovlies can't stand the sight of each other?!
Hang on... just remembered... the MC has got a bottle of Emily's aphrodisiac "Love Potion" in his pocket hasn't he?
Maybe that goes some way to explain it.
(One of them could be Tasha who expressed an interest in doing a bit of treasure hunting with Henry earlier.)