UMD-1018 · I Tried Making My Sister and Girlfriend's Pussies Explode With the Rumored "Sensitivity-Boosting Aphrodisiac" Energy Drink!!

A boyfriend feels like sex with his girlfriend hasn't been quite right lately. To make their sex the best it can be, he gets his hands on a certain aphrodisiac online. This mysterious, tasteless, and odorless liquid is rumored on social media to be a magic potion that enhances sexual desire!! He gathers his courage to buy it, but thinking it would be bad to use it on his girlfriend right away, he decides to test it on his sister first. When he secretly uses the aphrodisiac on his sister, the effect is immense!! It's even more powerful than the rumors!! With the experiment a success, he finally administers the aphrodisiac to his girlfriend!! However, the aphrodisiac works far better than expected, leading to a completely unforeseen turn of events!!