This character has sex in the tominagi position. Apply this trait to the penetrating partner and apply i936 to the penetrated partner.
In this position, the penetrating partner kneels in front of the receiving partner, with their torso mostly upright, while the receiving partner lies on their back, with their legs folded. They may rest their feet against the penetrating partner's torso.
This is similar to other butterfly positions, but the receiving partner is in a noticeably "curled up" position.
If the penetrating partner's torso is mostly horizontal and on top of the receiving partner, consider using the missionary trait instead.
Example 1a, Example 1b
Counter-example 1 - Use missionary instead since the penetrating partner is on top of, instead of in front of, the receiving partner