The affine vertex superalgebra A= L1(D(2,1;−v/w)) plays a key role as the geometric Langlands kernel VOA for SVOAs associated to so(3), osp(1|2) and other rank one Lie superalgbras. Since D(2,1; α) is an extension of the direct sum of 3 copies of sl(2), A can be naturally realized as an extension of L1 =Lk(sl(2))xLl(sl(2))xL1(sl(2)) for admissible levels k=u/v−2 and l=u/w−2. Here, I use constructions of gluing VOAs to realize A as an L1 extension, and the theory of VOA extensions to classify irreducible modules in A-wtmod≥0. Using the ‘Adamovic procedure’, an alternate realization of A is given as a subalgebra of Lk−1(sl(2))xBl, where the SVOA Bl is constructed from a ‘half-lattice’ and L1(sl(2)). This allows calculation of modular S-matrices for A modules induced from relaxed highest weight L1 modules.