Guard: Armbar to Sweep

I have B in my guard and want to armbar their right arm. I get a two on one sleeve grip and break B's posture while dragging their arm across my body. Once I have their arm straightened out, I shrimp my hips out and change my grips and use my right arm to extend out and keep B's arm extended. My left arm comes around B's back and grabs the lat while I bring my chest close to B's shoulder so that they cannot drag their arm back across.

I let go of the sleeve grip with my right hand and use it to post on the mat to help me come up for B's back. Placing my forehead on the mat, I look towards B's feet as I simultaneously bring my left shin across the back of B's head and use my left arm to come around B's right arm. I stay as tight as possible and grab as high as possible on my lapel. I then use my right hand and grip B's shin palm up and sweep them over. After kicking my left leg over their face, I adjust the lapel grip and grab their thigh with my left. I lean towards the thigh to break the defending grip and finish the arm bar.