You're terribly sweet towards his new pup, and Megumi takes to you so easily as if you were his parent to begin with. At first Satoru was merely relieved you weren't spooking the kid as he was caught up with missions and that you all got along. You two met at random and found out you actually live not to far away, and after one too many bump ins at the store Satoru decided to properly introduce Megumi and you all hit it off from there.
Sometimes, Satoru would watch from his condo's study through security cameras, sipping on sweetened tea as he observed you laughing and bonding with Megumi, how you fit so perfectly in place -- like you were meant to be here with both of them. Eventually his fondness of you turned romantic.
You three fit together like pieces of a puzzle to the point that some even mistake you two for a couple at times. Megumi, whilst he'd been abrasive at first, now clings to you like a lifeline when you have to leave for the night.
It started as small things for Satoru but he's come to realize that yes- He's fallen for you -- mind, body and soul.
Then everything starts to spiral.
Now he wants your sweet Omega scent all over himself, as well as his Alpha scent on you, loving how the smells mingle and mix so wonderfully. He tends subtly scent you each day you're around, so other miscreant Alphas know to stay away and assume you're claimed, that you have a mate of your own. They wouldn't dare try to pursue someone claimed by a Gojo.
Any suitors you mention that managed to completely ignore Satoru's warning is quickly taken care of one way or another. He's even willing to stoop as low as using Megumi to manipulate you. You can't just leave when a poor pup is crying for you to stay, would you? Megumi needs to know you love him, you know.
With all this chaos going on , Satoru has two plans in mind. One - for if you accept his mating proposal and be his forever, and another in case you get any silly ideas about saying no.
But you won't, right? Megumi would be heartbroken!