They’re having a great time!
Bob’s ankle nibbling is hilarious! I’ve never seen that particular form of foreplay in ours :~)
Could you hear her squealing? It was like she was going “Quiiiiiiiit!!” but then she wouldn’t quit egging him on either, and that went on for quite a while. He’d wander off and she’d circle around under his chin and cut him off, trying to hike her tail up under that fly sheet to entice him, and then going right back to it. It was really funny.