You want more sperm, get more sperm, but first you have to experience two dicks at once

3 tentacles shagged and impregnated Hu Tao (Genshin Impact)

Ke Qing farms primogams with double penetration (Genshin Impact)

It's a good thing we fucked in the ass - lots of sperm, but no knock-ups

Mona clearly made a mistake with the spell and is now pregnant with a tentacle