One last thing...

Once Emma was asleep, you snuck out of the bed again. You had another experiment to try, and needed space.

You went to the living room, laid down on a couch and tried to get as comfortable as possible. At best, this was going to suck. Just maybe you'd make it through it.

"I think I don't have a refactory period anymore, and can cum as often and as much as I want."

You were braced for the pain, but it still hit hard. Your head felt like it was being squeezed in a vice. Your stomach turned. Your vision started to close in, but you fought it.

By the time you had a clear thought again, you were on the floor in front of the couch, covered in sweat, and panting. But you were conscious.

You sat on the couch for a few minutes, gulping for breath. You were pretty sure it worked, but you were in no shape to test it now.

But you couldn't go to bed yet. There was one more thing. You weakly said, "I think no more sperm. Just lots of semen."

After another few minutes to recover, you got some water and crawled back into bed with the girls.