Was not really keen to get too involved here multi way with the underpair, then rivered a full house.

Folded to the shove as it just looked like villain (12/8 over 27 hands) slow played a monster to me. Just too bonkers to be doing that with anything besides AJ, AA or JJ. Seems a bonkers move with a flush that made it on the river, but of course this is 2NL….

What would you do?