Just watched the animations from the game "Lust Theory" (pretty good work, btw) and it gave me the idea for an additional possibility in Timestamps. In Lust Theory, at some point the MC gets the ability to clone himself (from what I understood just watching the anims, I could be wrong and in fact he just suddenly has a twin brother, but I doubt it), which of course leads to MMF and MMFF scenes, but the Ms are still the MC.
So in the case of Timestamps, I could totally see scenes where the MC was sent back in time twice (or more

) at the same moment. So you could create MMF scenes involving only the MC. And also write some fun story points where the MC has to explain why he suddenly has a twin brother, or even explain to his clone what he's doing here.
Of course I'm a partisan of normal sharing (MC+Bacon+female character for example) so please continue to make scenes like this, but I thought this would add a middle of the road possibility for people who'd rather like only the MC to have sex, while still being able to see MMF or MMFF scenes.