Looking for story - Cum replacement

Story by Sirrion Sunblaze

I'm trying to find a story that was posted here ages ago (~2010, I think) where a guy's been saving up his cum for ages to try and impregnate his wife, only to get cornered by a futa. She jerks him off until he's empty, then fills his balls up with her cum, and sends him off to knock up his wife with her seed. Anybody have any idea what this story is?