That cheeky young lady
Megan Rain! Stepfather catches Megan pleasuring herself at the forefront of the watercraft. He doesn't get motion illness. Rather, he's so thrilled he pops the question! Megan's delighted she swallows stepdad's sizable rod.
To keep things calm, he spins stepdaughter around to fill a crevice. - It's challenging to determine which has more movement. The sea or Megan's backside.
We can assume lusty Megan didn't get ill from the boat's motion as she swallowed stepfather's release.