I do have a little suggestion to finding a MILF if they get added,
finding a lost girl, he tries to help the little lady, (maybe a funny little scene where the MC gets mistaken for a Child... Hunter, [lack of a better word...])
and after a clear up, bam, new character! (or 2 if you wanna include an older sister of-age for a waifu.) And a precious lil kid you take care of!
Then again, you can probably just go for a Waifu Girl then that waifu girl introduces you to Waifu Milf...
Iunno, up to you! and if you want to add this ofc.