Yes!

"You cannot hold back, right?" Mari smirked as she pushed her tits together against his cock.

"Oniichan!" Yuika protested.

"Cum all you want," Mari smiled.

"No! Do not cum!" Yuika cried out but it was too late. A geyser of semen jettisoned from between Mari's breasts, splashing on her tits and his stomach.

"Nooooo!" Yuika whined.

"Your second load and still so much!" Mari smiling at her handiwork, bending down and took his cock into her mouth, sucking it clean.

Their brother-in-law blacked out again.