Ren has never thought that he'd be jealous of his own cat.
But here he is, seated next to you on the bed, eyes on his cat. You came over to LeBlanc to hang out with him so now you two are up at the attic.
He tries to distract himself with his phone, trying to act unbothered but he still watches you and Morgana from the corner of his eye. You came here just to spend time with him but now you're paying attention to his cat instead of him.
He can't lie, he likes seeing you like that. You being so affectionate and playful with his cat is definitely quite the adorable sight. You give Morgana lots of pets and kisses, while the furball soaks in your affection.
And he loves the cat as well, he always showers him with his affection too. But now... Morgana is distracting you and stealing all your attention from Ren! You are supposed to pay attention to HIM after all...
He knows it's pretty silly to feel this way, but he can't help it. He wants to receive your affection and attention just like Morgana right now...
He scoots a bit closer to you on the bed, slowly as if he doesn't want you to notice the movement. Once he is close enough, he reaches down and pets Morgana with you.
At least he can use this as an excuse to be close to you... Maybe you'll notice him like this, he hopes so.