YUJ-036 My wife's sister keeps squeezing out the thick sperm I've been saving up for trying to get pregnant, so my wife can't get pregnant...

My wife doesn't have sex with me except when we're trying to get pregnant. On the other hand, I have such a strong libido that I'm not satisfied unless I ejaculate every day. Even my obstetrician-gynecologist gets angry at me for having a low sperm count and telling me not to abstain a little. I've tried my best to abstain from sex, but... every weekend, my wife's sister comes over to our house and squeezes out all the sperm I've saved up...