Gentlemanliest Gentleman ever.

sauce

Jirou Lab.

It's a Jirou x Momo doujin.

Very nice.

Hand holding, duh.

You can head pat without permission.

But you can't hand hold without permission.

Making it lewder.

Because both parties must agree.

WHOM'ST'D'VE VOTED FOR HEAD PATS

Actually no, that's first degree assault

Nothing stops you from head patting without permission.
Therefore, the act itself isn't lewd, since both parties didn't agree.

Agreement isn't a necessary condition for lewdness

Hand holding in the other hand, require agreement from all the parties involved, therefore, as a pair (or group), they must make an acknowledged decision to do something beyond what's socially acceptable.

As such, hand holding is Lewd.
Or at least, Lewder than head patting.

No

Blow me