Disclaimer: I don't own Dragon Age.
Accident
The first time, it's almost an accident.
They're drunk and missing her and Alistair is fingering that damn rose and Zevran is turning her earring over in his hand, and they are talking – not about her, but about everything associated with her: great swords and crimson hair and tattoos that look like tears. Alistair is in the middle of a sentence – something about why great swords are so deadly – and Zevran leans forward and kisses him, because he was the last person to kiss her and he's looking for some trace of her on his lips.
He doesn't find any, but he can still almost feel her there, an echo of her where she touched their lives, and Alistair isn't complaining or trying to stop him, so he keeps going and before either of them really know what's going on they're a mess of sweat and limbs and moans and for a moment, they can both almost feel her again, in the scars she left on them both.
In the morning Alistair is awkward and Zevran is hungover and they're both empty, feeling the loss of her anew and Maker they miss her, and that night they start drinking and they aren't quite drunk when it happens again, the talk and the sex and the desperate search for some trace of her.