"Is it because I'm terrible at sex that I get soft halfway through?!" My inexperienced sister-in-law, wanting to "become better," tempted me to practice sex with her! And I actually ejaculated inside her without a condom before my brother did! HUNTC-576

My brother has absolutely no luck with women, but he's lucky enough to marry a stunning beauty! However, my sister-in-law came to me for advice, saying that they both lack experience and haven't been able to conceive. While troubled by this, she made a shocking request: "Is it because I'm terrible at sex...?" She specifically asked me to be her practice partner! Before I could even think, "Is it really okay to do this with my brother's wife...?", my beautiful sister-in-law launched a fierce attack on my penis using knowledge she'd learned online! Faced with her forbidden temptation, "I absolutely won't tell my husband...", my rationality completely crumbled! Since it was practice, of course, it had to be unprotected penetration! My sister-in-law isn't bad at all; she's incredibly horny. Watching her vigorously swaying in the riding position, my balls were already ready to plant their seed! Because it was supposed to be a real practice session, I naturally ejaculated inside her without a condom! Um, sister-in-law... this isn't practice; what if I actually get pregnant?!