Coubalt really got the expressions nicely on this one, I feel like it tells the story of Sam's first attempt at paizuri well! Starting off nervous, getting competitive/smug as she gets into it, and not having anything planned for when she gets splattered in baby batter. There's nothing cuter than a suddenly girlish tomboy, and Sam is out to prove it by accident.
I can mix and match the expressions/cum/spurt, so I'll play with it a bit in the actual scene, but this seemed like a simple progression for a preview!