New to fwb:need help understanding

So around Thanksgiving time. My coworker and I became friends with benefits as I go through finalizing my divorce. I dont know what is normal for fwb.

When we stay at each other pleace mostly mine now neither of us dont want the other leave after sex. We cuddle hug hold hands kiss randomly. My kids only know him as my coworker because he started to help me paint their rooms. He says we are friends but everything else confuses me. He got my kids Christmas presents and is giving them each a nintendo switch lite and is wanting to come join them on their birthday.

Can anyone help me understand if this is normal