That's a little concerning but it's very sweet. 

He is not going to say anything and he is going to pet Luna's hair and be so so happy and mildly concerned at himself for being happy when she is maybe not happy and also kind of turned on.

Sasha is very cuddly. And very much likes having his hair played with. 

He'll keep kissing Lev's neck, not constantly but every few minutes. 

He makes happy little whimpery noises whenever she kisses his neck.

He won't stop, then. 

He is sort of concerned that Luna might still be sad but neck kissing is very nice.

Is there a way to distract him from the fact that Sasha is genuinely unsure if he's still sad or not. 

Judging by the soft little noises neck kissing seems to be working.

He'll keep doing that then; he kisses his way up and down Lev's neck, scrapes his teeth against Lev's throat. 

The use of teeth leads to a small broken moan.

What if he bites. 

Then Lev will grab the sheets with his hands and moan very loudly.

That's a good sound. 

Sasha is not going to stop biting him, after a sound like that. 

"Oh god-- oh god-- Luna--"

"Lev —" and he bites again, hard enough to leave a mark. 

"I like it when you say my name."

"It's a nice name. Lev." He bites Lev's neck again. 

"Oh, oh-- Luna, you're so good, you're so-- mine, my good girl, my good Luna, my beautiful Luna--"

"Your good girl," bite, "your pretty girl, your Luna, yours —" bite, again, hard enough to leave a mark.  

"Oh--" he says. His hips are sort of thrusting up into the air.

Sasha reaches down and palms Lev's dick through his pants. 

He hisses and says, "I want to see your mouth on me. Get a condom?"

He gets a condom and pulls Lev's pants down and rolls it on, kisses Lev's stomach and hips. 

"You're so beautiful," he says affectionately, "and such a tease."

"You love when I tease," he says, and sinks down on Lev's cock.