in Carnival Phantasm when everyone is in Ahnenerbe we see Medea (Fate/Stay Night Caster) and Souichirou Kuzuki. but there is someone else with them
Medea has a girl on her lap and i know that girl is Len, the Succubus Demon Familiar who travelled with Arcueid Brunestud before she made a contract with Tohno Shiki in Kagetsu Tohya
Looking at them in this shot we see that they sorta look similar. similar hair and similar ears. but to my understanding in Carnival Phantasm Medea and Len never interacted with one another, yet here they are with Medea looking sorta motherly with Len in her lap.
Is there some sort of connection between Medea and Len which would indicate why 2 are like this in Ahnenerbe when they haven't interacted in the series?