[He inhaled sharply, not quite expecting that kind of a grope, though Bedivere's reaction had his breath trail off into a faint snicker once it's sunken in.]

It does that, yes, because of the blood flow. A good thing, too, because figuring out the logistics of sticking a limp dick into an orifice isn't the sexiest affair for either party.

[And just to prove his point, he'd drag his own fingers down the obvious bulge Bedivere sported -

Oh. Big, indeed.

Thinking about getting railed was pretty distracting.

With a sigh, Dazai reached behind him to undo his own obi. This was going to happen anyway, he told himself, even if this wasn't the sexy tease he'd envisioned.]

I'll show you mine if you show me yours.

As an aside: anyone who says size is the most important factor is an idiot. It's how you use it.