True, you can do that and get the sex with Sarah for free and I understand why you looked at Sarah/didnt look at Heather in that situation.
However, I had 2 really good reasons to look at Heather throughout that whole scene in the prep party:
1st Reason: Tommy was an ass and a cunt to the MC the whole game. So, the least that my MC could do to repay Tommys excellent execution as a father, was to give Heather the satisfaction she deserves but very obviously doesnt get from Tommy and show her what a real man can provide
. (This reason is now less important because after ep6 and the flawless ass whooping my MC gave Tommy, he actually redeemed himself in the rest of the ep, so I have no problems with Tommy has of right now).
2nd Reason and most important reason: CURIOSITY!! Heather is the only HOT that dislikes the MC and never gives the MC a single opportunity, not even for a harmless flirtation. This makes it seem like she is a forbidden fruit and sort of a challenge for my MC. So, because my MC is a giving man and he doesnt want to leave any HOT unfucked, he will do everything in his power to bring sexual satisfaction to every single HOT.
My MC will tease Heather so much in every single opportunity, that SHE will be the one to beg him to fuck her