An exciting day and a little bit of liquid courage

The day began with a very long shower. Contrary to the previous time, Cassidy let her older sibling soap her back, then her belly, her chest and finally her newly shaved pussy. Afterward, the younger sister felt obligated to reciprocate, though she didn't seem to be displeased by either part.

Once clean, the girls went to the pool again to swam, tan, and gossip. They were amused to see the same lifeguard as the previous time, but Cassidy was mortified when Carrie approached her right before their departure. They talked a few minutes of things the younger sibling couldn't hear, and finally the lifeguard came to her to give her her phone number with a wink. The virgin girl didn't know how to react and let her sister bring her to the next location: A lingerie store. She had not forgotten your conversation from a few nights ago and wanted to surprise you. They tried many things, using the same changing room as they were getting used to, and left with a pair of matching black lace ensembles with almost transparent thongs and bras, fishnet stockings and garterbelts. They next went to buy a few bottles of wine before going back home to make use of their new purchases. The two brunettes quickly jumped into their lingerie, then proceeded to get drunk. They had achieved most of their goal when the following discussion happened (both of the sisters remember this part vividly but are unable to tell how they went there):

Both of them were sitting on the couch, with their legs folded under them, glasses in hand, when Cassidy stopped everything to look Carrie in the eyes and mumble "I think I love you."

The older sibling didn't hesitate one second before answering "I love you too, sis." while caressing her thigh.

"No, I mean, I'm not talking about the family love between siblings, you know! It's more..."

"Cass..." Carrie interupted her with a soft smile, "I know what you mean, and I love you too."

Cassidy staid silent for a moment, trying to process the conversation so far, then replied "No, you don't understand, I mean I love you like... like..."

Her elder sister sighed and seized her cheeks, suddenly leaning toward her to kiss her passionately. It was long and wild, and your girlfriend's hands soon left Cassidy's face to go everywhere else. The younger girl was panting and moaning when they parted away, and stayed frozen in shock for a moment before stuttering "But... But I don't understand... You have a boyfriend!"

"Yeah, and I love him too. I can love several persons at the same time just like I can fuck several persons at the same time." she answered with as smile, while her hands were fondling the virgin's breasts.

"You... But I'm your sister!" she moaned.

"Yeah, and it makes everything even hotter. Now, let me take care of you."

And she took care of her. She played with her pussy like a musician plays an instrument, giving her orgasm after orgasm with her fingers and tongue. In a few hours, Cassidy discovered erogenous zones all over her body whose existence she didn't suspect.

When you finally got back from work, you found your girlfriend riding her baby sister doggy style with a strap-on, both of them facing the door to greet you.

"Welcome home, darling!" Carrie exclaimed. "You have many things to catch on!"