Tiffany was rubbing her gorgeous breasts with the BE oil, which was affecting her more and more. Katie had forgotten to mention sudden arousal was a secondary effect, but her friend didn't seem to mind. It was like she couldn't stop squeezing her boobs together, pinching her own nipples as they grew longer and the areolas larger. Her breasts enlarged easily to a D cup, falling beautifully on her chest.
"It's... ah... it's working, right?" Tiffany said, panting. "Tell me it looks good on me..." she moaned as she was cupping her swollen breasts together. Then she grabbed one of Katie's hand and pressed it against her right breast, almost begging her with her eyes.
Katie shuddered as she felt her friend's oiled nipple poking hard against her palm. Her heart raced, beating through her body and loins. She gave a gentle squeeze and a moan escaped Tiffany's lips. Katie put her other hand on her friend's chest, massageing Tiffany with the oil.
The breasts enlarged into E cups, overflowing her hands generously. Between her legs, Katie couldn't help her cock from throbbing weakly. Tiffany drew closer, her eyes almost closed, and Katie instinctively leaned on to kiss her lips - softly at first, then more hungrily. Tiffany was moaning louder and rubbing her thighs together, pressing her huge breasts against Katie's.
Katie felt a very hard bulge between her legs brush against Tiffany's skirt. She pushed her friend back, turning away to conceal her erection.
"I'm... I'm sorry Tiffany. I think we should stop... before I get any more oil over myself or stuff like that", Katie said with a blush. Tiffany couldn't see her face - or hard on.
"I... It must be the oil affecting me" Tiffany replied with a forced laugh, trying to make it look like it was nothing. "Don't mention it again, I feel more myself already", she lied. She was still very turned on, but didn't want Katie to freak out. Neither friend had felt this way before for girls; it was hard to know if this was just the BE oil or not.
"I'll wait outside the bathroom while you get dressed" Katie simply replied as she exited the room.
Once outside, she leaned against the wall next to the door, trying to keep calm and waiting for the erection to subside. Meanwhile Tiffany was squishing her breasts back into her shirt. She was unable to button it all the way up at this point, her cleavage visible and threatening to bust out.
When Tiffany came out of the bathroom, Katie's penis was mostly soft and the bulge concealed. The two friends couldn't look at each other, still embarassed by whatever had come over them a minute ago, although both were secretely wishing they had gone further.
"Let's... let's grab a few things and go home Katie, I'm tired", Tiffany let out quietly.