Whovever says cats can't love or feel loved is out of their mind, as cats have their own fashion of showing love and affection.
The one on the back looks like it's having a good time grooming the one in the front. I can tell, because its eyes are mostly closed.
The one in the front looks like its enjoying the act, as well. I can tell by the relaxed position of its head - it's relaxed, slightly tilted. That's a huge indicator. Also, another way that I know they're enjoying themselves is by looking at how thy're sitting on the ground. They're curling up slightly, indicating a well comfortable posture.
I praise this photograph, and I hope you enjoy your moments with them! !