Could I perhaps get a Zachary Quinto PB opposite my Tatiana Dumenti PB? I wanna do a psl where they are best friends and the Zach PB is a foreigner and needs to get married to stay in the US and asks her to "save" him. You can make him gay or not, I don't really mind. Obviously, if he was gay they could still have the jealousy that best friends have when one or the other is dating, or doing things with other people, etc, but they're sexual life would be nonexistent (for obvious reasons). Whether he feels guilty for making her stuck in a marriage with a gay man and live with no romance is your choice.
Alternatively, if you decide to write him straight, and there are other factors as to why he's not attracted to her that way, the line may end up being very different. Either way, I just love the pairing of Zach and Tatiana.