Chiyo-sama... you love Soujirou. Unbearably. And the Gods know he might even love you just as much.
Have another Saturday night of sake with your man but this time, make it into a contest. Being wasted is as good an excuse as you have to pull off anything.
Want your husband's child?
Easy. Open the idea of starting a family with him. A good discussion sets a good plan for the future. Ehe.
Otherwise... just stick thine tongue into his, push him down, straddle the man forcefully, then whisper into Soujirou's ear: "I can't take it anymore so.. Fuck me, and make sure to come inside". That should work too.