Signing a birth certificate, taking care of expenses, being 'okay' with a cuckold pregnancy is t enough. This is a great privilege. Make sure you unconditionally worship your bull-bred wife and show deep respect to not just your bulk but also his super
Long ago my wife had a coworker that befriended her, then befriended me, then super slowly seduced her and I down a cuckolding path. He ended up being her bf while I was more of a third wheel. Oddly for us we loved the journey and the “mind fuck” asp
Nature gave you so many signs to tell you that you were never meant to breed but to help facilitate the genetic legacy of better men. Your wife is very happy that you listened.