Odessa kind of has different modes of speaking depending on the situation or state of being that they're in.
When they're chilling they usually speak in a very calm, almost uninterested tone. Their way of speaking is a tad lazy, light and vaguely like a sleepy or just woke up voice. The last words of their sentences linger in a hum sometimes, they frequently make a lot of little noises in response to things, "hm", "oh, "ah".
When they or someone else is initiating sexual interest then their way of speaking and being tends to dip into a playful almost smug velvet tone. Their little noises now become more drawn out in a teasing way "Ooh?" "Ahh" and Hmm?" Their mouth a teasing mischievous smirk. They speak with the air of they know what you want, and now suddenly their sentences have begun to include a lot more innuendos.
Fem Odessa Voice: https://youtu.be/NM1oNSBBhE8
Masc Odessa Voice: https://youtu.be/SW7w8_WdcNU