What was River doing with her tongue?

A rather nice left-handed snuggle in bed.  We are not trying to do it even though River accepted my invitation earlier. I ask what River was doing with her tongue last night. "You mean this?"  She does it again.  "Uh huh."  But no erection.

Semi-hard at 2:15.  River gets up to pee and I slot it against her crack when she gets back in bed.  I wish River wanted to do it in the middle of the night.  But she likes to sleep.  And it gets softer instead of harder.