Pretend to be embarrassed by your hard-on

As you stare at Sophie's amazing little tits, your giant boner waving in the wind, you decide to keep playing up the embarrassment angle.

"Oh man," you say, looking down at yourself, "this is so embarrassing, I'm sorry. I didn't mean for this to happen."

"It's ok, Joe," Diana says, trying to reassure you, "I was actually about to ask you to get yourself hard anyway,"

"What?!" You say, feigning shock, "There's no way I could have gotten hard by myself...you saw how I couldn't even undress without Sophie doing it with me."

"Well, Joe, you're the only guy here, so there isn't anyone to get hard with you. Girls get wet, not hard."

"Really?" You ask, looking at Sophie, "Don't girls' nipples get hard? Sophie, if you got your nipples hard for me I'd feel so much less embarrassed.

Sophie, already blushing a bit at her exposure, blushes even deeper.

"I...I'm not sure how," she says, then quickly, "but I'd love to help if I could."

"Would it be ok if I showed her?" You ask Diana.

"It's up to her," she shrugs.

You look questioningly at Sophie, who takes a few steps closer to you.

"What do I do?" She asks.

"This might be strange, but I could do it for you," you say, reaching your hand slowly out towards her smooth, left breast. She takes an intake of breath, tensing slightly, but doesn't move away. "Is it ok to touch you?"

She pauses for two seconds, then nods.

You place your hand over her breast, giving it a light squeeze, a gentle massage- and it feels great, perfectly soft. She stares in rapt attention. Then you bring your fingers to her nipple, and gently, very gently, begin to squeeze it, working it in different ways.

Sophie starts to get red again, but with a very different expression on her face. Her chest flushes. As you squeeze her nipple, it definitely is getting hard under your touch. And she likes it.