The talk (part 3)

Penny told me the plan. She was going to invite Zena around on our 'sister afternoon', but I was to call in and say I would be late, leaving her alone with Zena.

Zena and Penny were relaxing by the pool. It was a lovely warm sunny day. They were both in bikinis, revealing their large DD breasts. I don't know where Zena got hers from as I am only C, but they are big and firm. Despite her inhibitions she is very proud of them. They had been talking about nothing in particular for 1/2 hour when Penny said. "So, do you still trust me?"...