HUNTC-150 A kind sister-in-law joins her new brother-in-law in the bath and lets him cum inside her

My new sister wanted to get to know me quickly, so she came to take a bath with me! Naturally, my dick started to expand in that situation... If I thought it was bad, she would find out and it would become awkward... But my sister-in-law was secretly in heat and said, "I want to get to know you sooner," and we became super close! When I was about to cum, she said, "You won't get pregnant if we're underwater," and guided me to insert it. And then I came inside her! My sperm overflowed from my pussy on the surface of the water! Is it really okay?