A sister who has no interest in her brother falls in love with his morning erection!? The sister, who decided to keep the morning erection as a pet, visits every morning to nuzzle, suck on the glans, or even use her vagina as a house and insert it! The brother acts coldly because she's a nuisance, but he can't help but be sweet and affectionate towards his morning erection! In the end, she even starts acting like a pet herself, wearing cat ears while cuddling up to his lower body! Brother and sister's incestuous triangular relationship!
