I'm wondering if Mitsunari/Hideyoshi/MC is an option
It is completely plausible, the MC/Mitsunari relationship definitely develops in this route, in some ways faster than it does in Mitsunari's own route. The problem is I think Hideyoshi is too selfish to want it. For a lot of this route there's a love triangle between Hideyoshi and Inuchiyo and the MC. Inuchiyo is the MC's childhood friend and very close with Hideyoshi but rather than pursuing a threesome Hideyoshi decides to 'steal' the MC away from Inuchiyo and 'make her his.' So I don't see him easily going along with a threesome with Mitsunari, and Mitsunari loves Hideyoshi too much to do something that he even a little doesn't want.
But look, maybe Hideyoshi will get less selfish eventually, or understand two of his lovers loving each other helps him somehow.
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It is completely plausible, the MC/Mitsunari relationship definitely develops in this route, in some ways faster than it does in Mitsunari's own route. The problem is I think Hideyoshi is too selfish to want it. For a lot of this route there's a love triangle between Hideyoshi and Inuchiyo and the MC. Inuchiyo is the MC's childhood friend and very close with Hideyoshi but rather than pursuing a threesome Hideyoshi decides to 'steal' the MC away from Inuchiyo and 'make her his.' So I don't see him easily going along with a threesome with Mitsunari, and Mitsunari loves Hideyoshi too much to do something that he even a little doesn't want.
But look, maybe Hideyoshi will get less selfish eventually, or understand two of his lovers loving each other helps him somehow.