Yes

The curiousity got to Sophie and she sighs.
"Ugh... Why are you so.. Touchy and horny all the time... Really this bitch was not a great influence for you... she better cum quickly."
Sophie tell Tania before grabbing her balls. Tania's body twitches slightly under Sophie's touch, and she was surprised herself.

You smile at how intrigued Sophie was but you were not gonna lose to your little sister on your own field. You started rubbing Tania's dick faster and kissed the crook of her neck. As if struck by a thunder Tania suddenly came back to life with a gasp.

Sophie's eyes widened from the surprise and froze. But the feeling of the warm balls in her hands made her want to explore Tania's reactions aswell. She fondled them, playing with the base, rolling them around her fingers like marbles, and scratching the line of Tania's urethra with her nail.

The warmth of the bath made Tania oversensitive, she clenched her teeth and fists feeling like her soul was trying to get out of her body through her dick, she just needed a little bit more. You looked up at Tania and saw how aroused she was. By now she should have already came so maybe there was somehing wrong with her.

You figured it was because Sophie was touching her aswell that Tania couldn't cum without any guilt. So you directed her gaze to you with a smile and kissed her in front of the whole bath.

Sophie felt both shocked and frustrated, she knew you were Tania's girlfriend and it was normal for you two to be like that, but she didn't want to lose this badly either... She pressed her breasts against Tania's side to have a better access to her manhood, stimulating her balls, her veins, and even playing with the base of her gland.

Sophie's hands started feeling Tania's balls pulsing and her dick throbbing harder, you could see that Tania was getting near orgasm so you started moving even faster. Tania couldn't handle anymore stimuli and finaly came undone releasing her load in the bath's water with a loud moan muffled by your kiss.

When Tania was done you slowly removed your lips from hers and let the her rest on her against the border while slowly rubbing her shaft to let the full orgasm end properly.

"Can't you just... Cum faster...?"
Sophie told Tania who was obviously too lost to understand anything. Her hand was still on Tania's balls and could feel how they were pulsing underwater. She released them and turned the other way trying to calm herself while Tania rested back on the bathwall.
"How annoying..."
she murmured to herself probably frustrated because of her defeat.

You smiled when everything was done and looked at them. Tania was resting and Sophie was kind of washing her hands. It was really funny. You decide to hug the both of them together against you. Even if Tania was reeling from ejaculation, she smiled and Sophie was surprisingly not disgusted by the hug either.