There isn't anyway that Squall is going to sustain this pace and not orgasm. He's a simple man without a crest and doesn't have the stamina of a certain blond missing an eye. With Byleth milking him it is soon that he finds himself tensing up and the orgasm that his him is so hard and fast that he didn't even get to properly prepare for it, cum getting all over Byleth's hole as he grabbed his waist tightly and left a mark.

"F-Fuck! Byleth!" He moans as he rides out his orgasm, thrusting a few more times before leaning back onto the bed and panting for a moment or too, his face flushed and eyes closed. "Fuck....that was...so hot...are you like this all the time?" Give him a few minutes to recover Byleth. He plans to go for round too.