He used Spirit Form Transformation on his arms, branched them out into tentacle-like shapes and they sank into Zadiris and Tarea's bodies. From the inside,
he released their muscle tension while using Materialization to massage them from the outside.
The Materialization skill he had gained when acquiring the Soul Breaker Job, to put it simply, was a skill that allowed him to materialize parts of his body that
had undergone Spirit Form Transformation.
It might seem that taking the effort to use Spirit Form Transformation only to materialize the body parts again would be meaningless, but Vandalieu had
intuitively sensed that it would be an extremely useful skill.. though not because he thought that he would be able to do tentacle play.