I think for the most part I kinda just space out and enjoy the pure bliss of the moment. the feeling of it pumping inside and wondering how it even fits in me.
My first time I panicked hard, got my hand up quick enough to hold his knot from getting in on the first one. But the second one he rammed in so quick and had me pinned I couldn't stop his knot, but holy crap did we both cum a lot.