Let $\mathcal{A}$ and $\mathcal{B}$ be two dg categories, and let $M \in \text{Mod}_{\mathcal{B}}^{\mathcal{A}}$ be a $\mathcal{A}$-$\mathcal{B}$ bimodule. In many references in framework of dg-categories, following 'tensor functor' is mentioned $$ - \otimes_{\mathcal{A}}M: \text{Mod}_\mathcal{A} \rightarrow \text{Mod}_\mathcal{B} $$ but none of them give concrete definition and proof of Quillen adjunction to $\text{Hom}_{\mathcal{B}}(M,-)$, which makes me confused.

In this paper Relative Calabi-Yau structures, $- \otimes _{\mathcal{A}} M$ is defined as the left Kan extension of $M$ and enriched Yoneda embedding $Y: \mathcal{A} \rightarrow \text{Mod}_{\mathcal{A}}$ without reasons for existence of this Kan extension.

I want to know more details about right definition of this functor.