Hi, Most signs I look for are if he is breathing heavily or has jerky movement, balling up or focusing on my hand like he is about to strike or squeezing to hard on my hand when handling. Although I can't be sure he fully enjoys it I do know he is not stressed his breathing is always normal he never clutches on to tight and is open not balled and has normal tongue flicks he doesn't try to run away or have hurried movements just is more active than most I see that are more stone like when handled. Its not like the one's I see don't move just they tend to find a comfy spot and relax he does that sometimes as well but likes to move around more. He will curl up in blankets on my bed and it's really adorable. If I ever thought he was stressed I would put him up as soon as possible I never like to see him stressed he makes me feel uncontrollable love for him and I only want the best.