I have a discrete group $G$ and classes $x,y\in H^1(G;\mathbb{Q})$ (group cohomology with coefficients in the rationals viewed as a trivial $G$-module) such that the Massey product $$\alpha:=\langle x, x, y\rangle\in H^2(G;\mathbb{Q})$$ is defined and has zero indeterminacy.

I would like to find a short exact sequence of $G$-modules $0\to \mathbb{Q}\to M\to N\to 0$ and a class $a\in H^1(G;N)$ which maps to $\alpha$ under the associated Bockstein operator $\beta\colon\thinspace H^1(G;N)\to H^2(G;\mathbb{Q})$.

Is this always possible? If so, is there a procedure for doing this? If not, are there known necessary or sufficient conditions (on the group $G$, or the classes $x$ and $y$)?

**What I know**

I'm attempting to use the interpretations of low-dimensional group cohomology described in Chapter IV of the book of Brown. Using the standard resolution, the classes $x$, $y$ are represented by derivations $d_x,d_y\colon\thinspace G\to \mathbb{Q}$, which I can write down explicitly. I am also able to write down cochains $\lambda,\mu\in C^1(G;\mathbb{Q})$ (essentially just functions $G\to \mathbb{Q}$) satisfying $\delta\lambda = d_x\cup d_x$ and $\delta\mu=d_x\cup d_y$. This enables me to write down explicitly the central extension $$0\to\mathbb{Q}\to E\to G\to 1$$ which represents the class $\alpha$. But I'm not sure where to go from here.

One approach would to look for a $G$-module $M$ which has $\mathbb{Q}\hookrightarrow M$ as a trivial submodule, and such that $\alpha$ is in the kernel of the induced map $H^2(G;\mathbb{Q})\to H^2(G; M)$. But again I'm not sure how to go about doing this.

Any general suggestions would be appreciated.