There is a possibility of a MC romantic character outside of "D only" that has been discussed, and that's a polyamory path where MC does not cheat, but is a route open to and accepted by Daughter. Coming out is a movie about the creater of Wonder Woman, William Marston, and his polyamorous relationship with two women -
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-. In addition there have been multiple movies made about polyamorous relationships. In fear of dating myself, my favorite is the 1982 Daryl Hannah film, Summer Lovers. -- The key is MC remains "faithful" to the relationship because polyamory is specifically not cheating and is a relationship bought into by all parties. Here is 70+ other films about polyamory -
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.