In the bed room with Millie and Patti

Both Millie and Patti take a seat on Millie's bed. Patti looks at Millie and says:

"Sorry if I called you a big titted slut, you know you are gorgeous and I am jealous of those big tits of yours."

Patti puts one of her hands on one of Millie's breasts, gives it a light squeeze, and says:

"I am so jealous of these."

Millie puts both her hands on Patti's tits inside Patti's bathrobe, rubs them a bit and says:

"You got amazing tits too Patti, they are real unlike mine and for a 47 year old they are amazingly firm."

They are sitting there touching each other's tits, and I feel my dick start to grow hard. I want to figure out a way to include myself in the mix, but what should I do or say?