The UTG raise is a Reg with 22/17, AF3. He is folding to 3 bets in EP vs MP a lot, thats the reason why I just call. I think there are pros and cons but I think its okay. The Problem is, that the BB coudl now cheaply see a Flop. He looks like hes loose but i dont know him.

The Flop is good for me but i dont like raising much here. I want that small PP are calling at least once and the UTG Raise isnt so weak because hes betting against 2 players.

The turn isnt the worst card for me. I think the bb could easiliy have A5 or 56 especially suited. Sets or 2 pair would have been raised on the Flop from the BB so I think I could discount these combos.
UTG would bet A5s I guess, any sets. I think when both check to me , I have nearly always the best hand. I bet pretty big because of the 2 players how could call a lot with worse, any draws etc.

The 3 on the river doesnt change mutch i think. But because they both called im quit unsure how big i should bet.
I bet a litte more than half pot in the case that the BB is shoving i could still fold, but can also get value of a Q or a worse PP.

So my question is how big/small I should bet here