[M4F] My sister craves my cock because of a virus

Lately viruses haven't been like they used to be. No longer to they make someone sick like normal. Now they only affect peoples libido and sexual attraction. Certain ages are immune to these viruses and the viruses won't have someone want an immune individual. But because some viruses could make family members want each other and change one person's genetics enough so no birth defects could happen any laws against incest have been removed. Now like all viruses some people can be carriers and never get the virus themselves. I didn't know I'm a carrier for such an insane incest virus that has an insanely low infection rate that it was next to impossible for it to be caught. Or so everyone thought, turns out if you drink someone's spilt who carries the virus it has a 100 percent chance of infection. The way me and my sister found this out was when I drank after her, I laughed while drink and some of my spit got into her drink. When the next day she showed signs of wanting to sleep with me she went to the doctor and I came with. The virus she had is the one I'm a carrier for, and she was one of around twenty people infected. The virus made the infected want only one member of their family and would wake up every morning getting far to aroused till they would be creampied by or creampie the person they want, not only that there is no way to cure them. So it's been a month and my sister asks for creampies at least once a week. I can only imagine how much crazier the virus will affect her

((Everyone in this rp are 18 years or older.

Limits: Gore, vore, toilet play, diaper play, feet, hypnosis, degradation, humiliation, rape, bdsm, and toys

Kinks: Seductive touching, my neck getting kissed/licked/bitten/sucked, being marked, nails being dug into my back, really long tongues, my partner being obsessed with me and cuddling))